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Taxable Income and Allowable Deductions

Calculate taxable income by identifying gross income and subtracting only the deductions that are genuinely allowable.

50 min MS-F1 4 MC 4 WE Lesson 7 of 14 Free
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Choose how you work: type answers on screen, or work in your book.

Think First

Most people assume that the ATO taxes everything you earn. But what if you spent $800 on work boots, $1,200 on a professional development course, and donated $500 to a registered charity? The tax system allows you to subtract certain work-related costs from your income before tax is calculated — meaning you pay tax on less. This is called a deduction, and knowing what qualifies is worth real money. Before we do the maths, think: what kinds of expenses do you think should count as tax deductions, and why?

Type your initial response below — you will revisit this at the end of the lesson.

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Come back to this at the end of the lesson.

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Key Relationships — This Lesson

$\text{Taxable income} = \text{Gross income} - \text{Total allowable deductions}$
Tax is calculated on taxable income — not on gross income
$\text{Gross income} = \text{Salary} + \text{Interest} + \text{Rental income} + \ldots$
All assessable income sources — wages, bank interest, rental income, certain government payments
$\text{Allowable deductions} = \text{Sum of all eligible work-related and approved expenses}$
Must be directly incurred in earning income — personal expenses do not qualify
Reverse formula:   $\text{Allowable deductions} = \text{Gross income} - \text{Taxable income}$   (use when taxable income is given)

Know

  • The formula: taxable income = gross income − allowable deductions
  • That gross income includes all assessable income (salary, interest, rental income)
  • Examples of allowable and non-allowable deductions

Understand

  • Why tax is applied to taxable income, not gross income
  • Why not all expenses qualify as deductions (personal vs income-earning)
  • Why PAYG tax withheld is not an allowable deduction

Can Do

  • Identify which items in a list are allowable deductions
  • Calculate gross income from multiple sources
  • Calculate taxable income and work backwards from taxable income to find deductions

Misconceptions to Fix

✗

Wrong: Taxable income is the same as gross income.

✓

Right: Taxable income = gross income minus allowable deductions (work-related expenses, donations, etc.). You only pay tax on taxable income.

Core Content

Key Terms
Taxable IncomeGross income minus allowable deductions — the amount on which tax is calculated.
Gross IncomeTotal income from all sources before any deductions.
Allowable DeductionWork-related expenses that can be subtracted from gross income to reduce taxable income.
Tax OffsetA reduction in the amount of tax payable, also called a tax rebate.
Medicare LevyA 2% levy on taxable income to fund the public health system.

Gross Income vs Taxable Income

Gross income is everything you earn; taxable income is the smaller figure the ATO actually uses to calculate your tax bill.

Gross income includes your salary or wages, interest earned on bank accounts, rental income from investment properties, and certain government payments. It is the total of all assessable income before any deductions.

Taxable income is gross income minus allowable deductions. The distinction matters because income tax is calculated on taxable income, not gross income. Reducing your taxable income — legally, through legitimate deductions — reduces the tax you owe.

FROM GROSS INCOME TO TAX PAYABLE GROSS INCOME Salary + interest + other income minus ALLOWABLE DEDUCTIONS Work-related expenses equals TAXABLE INCOME Tax is applied to THIS figure TAX BILL Tax is never applied to gross income — always start by calculating taxable income
Deductions reduce taxable income, which directly reduces the tax bill.
Tax is calculated on taxable income, not gross income: Always complete the taxable income calculation before attempting any tax calculation. Applying tax brackets to gross income is a guaranteed error.
Common error — Not all expenses are deductions: Only expenses directly related to earning income and not reimbursed by the employer qualify. Personal expenses — gym memberships, groceries, commuting to your regular workplace — are not deductible, even if they feel work-related.
Interactive Tool — Budget Planner Open fullscreen ↗
Activity

Allowable Deductions — What Qualifies?

The ATO has specific rules about what counts as a deduction — the general principle is that the expense must be directly incurred in earning your assessable income.

Allowable ✓Not allowable ✗
Work tools and equipmentTravel from home to regular workplace
Uniforms and protective clothingConventional clothing worn at work
Professional development coursesPersonal grooming and gym memberships
Work-related textbooks and resourcesPrivate or domestic expenses
Union fees and professional membershipsMeals (unless travelling overnight for work)
Donations to registered DGRs ($2+)Donations to unregistered causes
Home office expenses (if required)General home expenses
List the allowable deductions first, then total them: Don't try to identify and add simultaneously. Write each qualifying deduction with its amount, then sum — this earns method marks and prevents omissions.
Common error — Donations only qualify if made to a registered DGR: Giving money to a friend's fundraiser does not qualify. HSC questions will state "registered charity" or "deductible gift recipient" when a donation qualifies. If it just says "donation" with no further detail, treat it as non-deductible unless clarified.
Insight — The general principle: An expense is deductible if it is incurred in gaining or producing assessable income and is not private, domestic, or capital in nature. This principle helps you reason through unfamiliar cases in the exam — ask: "Did the worker need to spend this money specifically because of their job?"
Activity

Calculating Taxable Income — Full Process

Taxable income calculation follows a fixed sequence: identify all income sources, identify all allowable deductions, then subtract.

StepAction
1List all income sources and sum to get gross income
2Go through each listed expense and determine if it is allowable
3Sum only the allowable deductions
4Taxable income = Gross income − Total allowable deductions
5Label taxable income clearly before moving to any tax calculation

In HSC extended response questions, part (a) often asks for taxable income, and parts (b) and (c) build on that figure. An error in part (a) flows through the entire question — but markers will still award marks in later parts if you use your part (a) answer consistently.

Show the subtraction explicitly: Write "Taxable income = $X − $Y = $Z" as a standalone line. Don't bury it in a calculation chain — it needs to be clearly identifiable for the marker.
Common error — Don't include PAYG tax withheld as a deduction: PAYG tax is not an allowable deduction from income. It is a prepayment of tax — it reduces your tax bill at the end of the year, but it is not subtracted when calculating taxable income. Confusing this costs marks.

Check Your Understanding

Summarise the method from this section in 2–3 bullet points.

A Quick Filter for Testing Deductions

When a question gives a long list of expenses, the fastest reliable method is to test each one against a simple decision rule.

Ask three questions:

  1. Was the expense incurred in earning assessable income?
  2. Was it private or domestic in nature?
  3. Was the worker reimbursed for it?

If the answer to the first question is yes and the second and third are no, the expense is usually deductible in this level of HSC-style problem.

Exam technique: Put a quick tick or cross beside each listed expense before you total anything. This helps prevent you from accidentally including a non-deductible item in the final subtraction.
Reasonableness check: Taxable income should be lower than gross income, but not dramatically lower unless the deductions list is very large. If your deductions look suspiciously huge, review which items you included.

Check Your Understanding

Write one sentence summarising the main mathematical idea of this section.

Worked Examples

Worked Example 1 Identifying Deductions

Problem

Sophie is a secondary school teacher. Her annual salary is $89,400. She also earned $640 interest on a savings account. During the year she spent: $480 on textbooks and classroom resources, $320 on a professional development course, $180 on a conventional work wardrobe, $250 donation to a registered charity, $860 on daily train travel to school. Calculate her taxable income.

Solution

1 $\text{Gross income} = \$89{,}400 + \$640 = \$90{,}040$ Salary plus bank interest — both are assessable income

Check Your Understanding

Write one sentence summarising the main mathematical idea of this section.

Worked Example 2 Multiple Income Sources

Problem

David earns a salary of $74,200, receives $1,850 in rental income from an investment property, and earned $420 in bank interest. His allowable deductions total $3,640. Calculate his taxable income.

Solution

1 $\text{Gross income} = \$74{,}200 + \$1{,}850 + \$420 = \$76{,}470$ Sum all three assessable income sources

Check Your Understanding

Write one sentence summarising the main mathematical idea of this section.

Worked Example 3 Working Backwards

Problem

Anika's taxable income is $61,450. Her gross salary is $64,800 and she earned $380 in interest. What were her total allowable deductions?

Solution

1 $\text{Gross income} = \$64{,}800 + \$380 = \$65{,}180$ Sum salary and interest

Check Your Understanding

Write one sentence summarising the main mathematical idea of this section.

Worked Example 4 Mixed Deduction List

Problem

Olivia earned $72,400 in salary and $560 in bank interest. Her listed expenses are: $420 union fees, $660 professional registration, $240 conventional business clothes, $1,150 commuting costs, and a $300 donation to a registered charity. Calculate her taxable income.

Solution

1 $\text{Gross income} = \$72{,}400 + \$560 = \$72{,}960$ Salary plus interest

Check Your Understanding

Write one sentence summarising the main mathematical idea of this section.

Revisit Your Initial Thinking

Look back at what you wrote in the Think First section. What has changed? What did you get right? What surprised you?

Practice Problems

Work through these problems to consolidate your understanding.

  1. Calculate the gross when given the following data.
  2. A real-world scenario involves taxable income and allowable deductions. Set up the calculation and solve.
  3. Explain the relationship between gross income vs taxable income and allowable deductions — what qualifies?.

Application Task

Apply your knowledge to solve this multi-step problem.

A taxable income and allowable deductions problem requires you to analyse data, perform calculations, and interpret the result in context. Show all working and justify each step.

Check Your Understanding

Checkpoint Questions

Select the best answer for each question. Feedback appears after you choose.

MC

Multiple Choice

5 random questions from a replayable lesson bank — feedback shown immediately

Which of the following is an allowable tax deduction?

A) Daily train fare from home to a regular office
B) Gym membership to stay fit for a physical job
C) Union membership fees
D) Conventional business attire purchased for work

A worker's taxable income is $83,200. Their gross salary is $86,500 and they received $750 in interest. What were their total allowable deductions?

A) $3,300
B) $4,050
C) $3,750
D) $2,550

Which item should NOT be counted as an allowable deduction in a standard HSC-style tax question?

A) Union fees
B) Work-related textbooks
C) Donation to a registered charity
D) PAYG tax withheld

Written Response Practice

These questions focus on classifying deductions accurately before doing the subtraction.

Short Answer 1

A worker earns $64,500 in salary and $700 in bank interest. Their allowable deductions total $2,850. Calculate their taxable income.

Short Answer 2

A worker's taxable income is $58,900. Their salary is $61,200 and they earned $300 in interest. Calculate their total allowable deductions.

Short Answer 3

A worker earns $78,000 salary. Their listed expenses are $520 union fees, $860 commuting costs, $290 donation to a registered charity, and $430 work-related textbooks. Calculate their taxable income.

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Speed Race

Race Through Taxable Income!

Answer questions on taxable income and allowable deductions. Pool: lessons 1–7.

Taxable Income Lightning Round

Use this as a quick deduction filter drill: income first, allowable expenses second, taxable income last.

Which formula gives taxable income?

A) Taxable income = Gross income + deductions
B) Taxable income = Gross income - allowable deductions
C) Taxable income = Net pay - PAYG
D) Taxable income = Gross income × tax rate

Which is generally an allowable deduction?

A) Professional membership fees
B) Daily commuting to work
C) Regular groceries
D) Conventional office clothes

Gross income is $70,000 and allowable deductions are $2,400. What is taxable income?

A) $72,400
B) $67,400
C) $68,600
D) $67,600

Why is PAYG tax withheld not counted as an allowable deduction when calculating taxable income?

A) Because it is always refunded
B) Because it only applies to interest income
C) Because it is a prepayment of tax, not an expense incurred in earning income
D) Because it is part of net pay
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